root@ubuntu:/boot# grub-probe -vvv /
grub-probe: info: cannot open `/boot/grub/device.map': No such file or directory.
grub-probe: info: /dev/vdc is not present.
grub-probe: info: Looking for /dev/vdc.
grub-probe: info: /dev/vdc is a parent of /dev/vdc.
grub-probe: info: /dev/vdc is present.
grub-probe: info: Looking for /dev/vdc.
grub-probe: info: /dev/vdc is a parent of /dev/vdc.
grub-probe: info: /dev/vdc is present.
grub-probe: info: Looking for /dev/vdc.
grub-probe: info: /dev/vdc is a parent of /dev/vdc.
grub-probe: info: opening hostdisk//dev/vdc.
grub-core/kern/disk.c:196: Opening `hostdisk//dev/vdc'...
grub-probe: info: drive = 0.
grub-probe: info: the size of hostdisk//dev/vdc is 18432000.
grub-core/kern/fs.c:56: Detecting zfs...
grub-core/osdep/hostdisk.c:415: opening the device `/dev/vdc' in open_device()
grub-core/fs/zfs/zfs.c:1192: label ok 0
grub-core/osdep/hostdisk.c:394: reusing open device `/dev/vdc'
grub-core/osdep/hostdisk.c:394: reusing open device `/dev/vdc'
grub-core/osdep/hostdisk.c:394: reusing open device `/dev/vdc'
grub-core/osdep/hostdisk.c:394: reusing open device `/dev/vdc'
grub-core/fs/zfs/zfs.c:1192: label ok 1
grub-core/osdep/hostdisk.c:394: reusing open device `/dev/vdc'
grub-core/osdep/hostdisk.c:394: reusing open device `/dev/vdc'
grub-core/osdep/hostdisk.c:394: reusing open device `/dev/vdc'
grub-core/fs/zfs/zfs.c:1192: label ok 2
grub-core/osdep/hostdisk.c:394: reusing open device `/dev/vdc'
grub-core/osdep/hostdisk.c:394: reusing open device `/dev/vdc'
grub-core/osdep/hostdisk.c:394: reusing open device `/dev/vdc'
grub-core/fs/zfs/zfs.c:1192: label ok 3
grub-core/osdep/hostdisk.c:394: reusing open device `/dev/vdc'
grub-core/osdep/hostdisk.c:394: reusing open device `/dev/vdc'
grub-core/kern/fs.c:78: zfs detection failed.
grub-core/kern/fs.c:56: Detecting xfs...
grub-core/fs/xfs.c:887: Reading sb
grub-core/fs/xfs.c:243: Validating superblock
grub-core/kern/fs.c:78: xfs detection failed.
grub-core/kern/fs.c:56: Detecting ufs2...
grub-core/kern/fs.c:78: ufs2 detection failed.
grub-core/kern/fs.c:56: Detecting ufs1_be...
grub-core/kern/fs.c:78: ufs1_be detection failed.
grub-core/kern/fs.c:56: Detecting ufs1...
grub-core/kern/fs.c:78: ufs1 detection failed.
grub-core/kern/fs.c:56: Detecting udf...
grub-core/osdep/hostdisk.c:394: reusing open device `/dev/vdc'
grub-core/osdep/hostdisk.c:394: reusing open device `/dev/vdc'
grub-core/osdep/hostdisk.c:394: reusing open device `/dev/vdc'
grub-core/kern/fs.c:78: udf detection failed.
grub-core/kern/fs.c:56: Detecting tarfs...
grub-core/kern/fs.c:78: tarfs detection failed.
grub-core/kern/fs.c:56: Detecting squash4...
grub-core/kern/fs.c:78: squash4 detection failed.
grub-core/kern/fs.c:56: Detecting sfs...
grub-core/kern/fs.c:78: sfs detection failed.
grub-core/kern/fs.c:56: Detecting romfs...
grub-core/kern/fs.c:78: romfs detection failed.
grub-core/kern/fs.c:56: Detecting reiserfs...
grub-core/kern/fs.c:78: reiserfs detection failed.
grub-core/kern/fs.c:56: Detecting procfs...
grub-core/kern/fs.c:78: procfs detection failed.
grub-core/kern/fs.c:56: Detecting odc...
grub-core/kern/fs.c:78: odc detection failed.
grub-core/kern/fs.c:56: Detecting ntfs...
grub-core/kern/fs.c:78: ntfs detection failed.
grub-core/kern/fs.c:56: Detecting nilfs2...
grub-core/osdep/hostdisk.c:394: reusing open device `/dev/vdc'
grub-core/kern/fs.c:78: nilfs2 detection failed.
grub-core/kern/fs.c:56: Detecting newc...
grub-core/kern/fs.c:78: newc detection failed.
grub-core/kern/fs.c:56: Detecting minix_be...
grub-core/kern/fs.c:78: minix_be detection failed.
grub-core/kern/fs.c:56: Detecting minix3_be...
grub-core/kern/fs.c:78: minix3_be detection failed.
grub-core/kern/fs.c:56: Detecting minix3...
grub-core/kern/fs.c:78: minix3 detection failed.
grub-core/kern/fs.c:56: Detecting minix2_be...
grub-core/kern/fs.c:78: minix2_be detection failed.
grub-core/kern/fs.c:56: Detecting minix2...
grub-core/kern/fs.c:78: minix2 detection failed.
grub-core/kern/fs.c:56: Detecting minix...
grub-core/kern/fs.c:78: minix detection failed.
grub-core/kern/fs.c:56: Detecting jfs...
grub-core/kern/fs.c:78: jfs detection failed.
grub-core/kern/fs.c:56: Detecting iso9660...
grub-core/kern/fs.c:78: iso9660 detection failed.
grub-core/kern/fs.c:56: Detecting hfsplus...
grub-core/kern/fs.c:78: hfsplus detection failed.
grub-core/kern/fs.c:56: Detecting hfs...
grub-core/kern/fs.c:78: hfs detection failed.
grub-core/kern/fs.c:56: Detecting fat...
grub-core/kern/fs.c:78: fat detection failed.
grub-core/kern/fs.c:56: Detecting ext2...
grub-core/kern/fs.c:78: ext2 detection failed.
grub-core/kern/fs.c:56: Detecting exfat...
grub-core/kern/fs.c:78: exfat detection failed.
grub-core/kern/fs.c:56: Detecting cpiofs_be...
grub-core/kern/fs.c:78: cpiofs_be detection failed.
grub-core/kern/fs.c:56: Detecting cpiofs...
grub-core/kern/fs.c:78: cpiofs detection failed.
grub-core/kern/fs.c:56: Detecting cbfs...
grub-core/osdep/hostdisk.c:394: reusing open device `/dev/vdc'
grub-core/kern/disk.c:421: Read out of range: sector 0x1194000 (attempt to read or write outside of disk `hostdisk//dev/vdc').
grub-core/kern/fs.c:78: cbfs detection failed.
grub-core/kern/fs.c:56: Detecting btrfs...
grub-core/kern/fs.c:78: btrfs detection failed.
grub-core/kern/fs.c:56: Detecting bfs...
grub-core/kern/fs.c:78: bfs detection failed.
grub-core/kern/fs.c:56: Detecting afs...
grub-core/kern/fs.c:78: afs detection failed.
grub-core/kern/fs.c:56: Detecting affs...
grub-core/kern/fs.c:78: affs detection failed.
grub-probe: error: unknown filesystem.